Nokia took the world by surprise last year when they released their 41MP PureView 808 running on Symbian. Rumor has it that an updated version of the sensor could be coming to Windows Phone 8. According to The Verge, it will end up in a high-end aluminum body - rather than polycarbonate - Lumia currently code-named EOS and will be available by AT&T later this year.
Although 41 megapixels were initially considered overkill by photography enthusiasts, it was slowly revealed that there was a method to Nokia's madness. It enabled pixel oversampling which means the combination of many pixels into one more accurate pixel. So basically all those pixels were used to make up better quality 3MP, 5MP and 8MP images. Or by sacrificing the oversampling ratio you gained around 3x lossless zoom for stills, 4x zoom in full HD 1080p and for 720p HD video 6x lossless zoom. And since it's the sensor being zoomed-in on, not optics, it's completely silent.
Then there was the actual size of the sensor. At 1/1.2" it was approximately 2.5 larger than the sensor used in the Nokia N8 (another phone famous for its image quality), and 5x larger than rival smartphones at the time of the 808's release. In combination with the way the zoom worked this meant faster shutter speeds when zoomed-in and a relatively shallow depth of field.
Since the 808's 41 megapixels were proven not to be a gimmick and considering Symbian was thought to be a major drawback by many, a Windows Phone version could prove popular with both photography enthusiasts and a more mainstream crowd.